Righto, you need to scour eBay, but they range between £80 to (as seen in previous posts) £150 from Merc...(I paid the lower end, and yes I'm silly!)
Here are my lights "at night" (taken at 19:00)...
View attachment 74279
And here they are this morning at 08:10
View attachment 74280
Here is a pic of the units showing the heatsinks (from the web, I wasn't hauling mine out of the door to show you that)
The lenses in the pic above are NOT sunken, they are clear and flush with the bottom.
A lot of the Chinese/cheapy ones actually have a lens that protrudes from the bottom, which (in some cases) may foul a door - whereas the Merc ones are a direct size replacement.
The only difference was the connector changed location & direction so they are a bit "deeper".
The ones I ordered were part no A2138200703
The ones in the pic above are A1668205900 - so there may be some different ones about (i.e. Merc / AMG) but the 703 ones are the STAR.